Her loss has struck a somber note with her fans; the hashgtag #RIPFloyd is already trending on Twitter.

Floyd has been with the award-winning artist through some of her toughest times this past year. Her pet pooch stood by her side during her split with her former fiancé, "The Hunger Games" star Liam Hemsworth, through the backlash over her performance at the MTV Video Music Awards, and has showered her with kisses, which she regularly documents on Instagram.

Floyd passed away just shy of his third birthday on May 5. Cyrus has not released a statement about the cause of death.

The "We Can't Stop" songbird is also the puppy parent to German Shepherd Mate, Rottweiler-beagle mix Happy, Chihuahua mix Bean, and rescue pup Mary Jane, whom she adopted with Hemsworth.